First of all, it is awesome that you are recognizing that you need help and change as much as your wife.

This site is a really good place to start. There are lots of tools available in links at the top and left side of the page. You may also want to talk with your wife's therapist/support team about resources they may be familiar with for spouses/family of BPD patients. While live support groups for BPD family members are rare, some have found that co-dependancy and Al Anon groups address some of the same struggles and behaviors that you will need to address for yourself.
I think it's also helpful to get some specific advice/brainstorming from members on the pattern/issue that you find most urgent/distressing at the moment. It can help you see how the tools can fit into your specific situation.
BeagleGirl